126 lines
5.3 KiB
C
126 lines
5.3 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id:$
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*
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* Copyright (C) 2010 Marcin Bukat
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include "cpu.h"
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#include "kernel.h"
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#include "system.h"
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#include "power.h"
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#include "timer.h"
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/* Settings for all possible clock frequencies (with properly working timers)
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*
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* xxx_REFRESH_TIMER below
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* system.h, CPUFREQ_xxx_MULT |
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* | |
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* V V
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* PLLCR & Rftim. IDECONFIG1/IDECONFIG2
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* CPUCLK/Hz MULT ~0x70c00000 16MB CSCR0 CSCR1 CS2Pre CS2Post CS2Wait
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* -------------------------------------------------------------------------
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* 11289600 1 0x00000200 4 0x0180 0x0180 1 1 0
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* 22579200 2 0x05028049 10 0x0180 0x0180 1 1 0
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* 33868800 3 0x03024049 15 0x0180 0x0180 1 1 0
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* 45158400 4 0x05028045 21 0x0180 0x0180 1 1 0
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* 56448000 5 0x02028049 26 0x0580 0x0580 2 1 0
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* 67737600 6 0x03024045 32 0x0580 0x0980 2 1 0
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* 79027200 7 0x0302a045 37 0x0580 0x0d80 2 1 0
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* 90316800 8 0x03030045 43 0x0980 0x0d80 2 1 0
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* 101606400 9 0x01024049 48 0x0980 0x1180 2 1 0
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* 112896000 10 0x01028049 54 0x0980 0x1580 3 1 0
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* 124185600 11 0x0102c049 59 0x0980 0x1180 3 1 1
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*/
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#define MAX_REFRESH_TIMER 59
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#define NORMAL_REFRESH_TIMER 21
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#define DEFAULT_REFRESH_TIMER 4
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#ifdef HAVE_ADJUSTABLE_CPU_FREQ
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void set_cpu_frequency (long) __attribute__ ((section (".icode")));
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void set_cpu_frequency(long frequency)
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#else
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void cf_set_cpu_frequency (long) __attribute__ ((section (".icode")));
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void cf_set_cpu_frequency(long frequency)
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#endif
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{
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switch(frequency)
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{
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case CPUFREQ_MAX:
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DCR = (0x8200 | DEFAULT_REFRESH_TIMER);
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/* Refresh timer for bypass frequency */
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PLLCR &= ~1; /* Bypass mode */
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timers_adjust_prescale(CPUFREQ_DEFAULT_MULT, false);
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PLLCR = 0x0102c049 | (PLLCR & 0x70C00000);
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CSCR0 = 0x00001180; /* Flash: 4 wait states */
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CSCR3 = 0x00001180; /* LCD: 4 wait states */
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while(!(PLLCR & 0x80000000)) {}; /* Wait until the PLL has locked.
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This may take up to 10ms! */
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timers_adjust_prescale(CPUFREQ_MAX_MULT, true);
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DCR = (0x8200 | MAX_REFRESH_TIMER); /* Refresh timer */
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cpu_frequency = CPUFREQ_MAX;
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IDECONFIG1 = (1<<28)|(1<<20)|(1<<18)|(1<<13)|(3<<10);
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/* BUFEN2 enable on /CS2 | CS2Post 1 clock| CS2Pre 3 clocks*/
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IDECONFIG2 = (1<<18)|(1<<16)|(1<<8)|(1<<0); /* TA /CS2 enable + CS2wait */
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and_l(~(0x07<<16), &ADCONFIG);
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or_l(((1<<7)|(1<<2)|(1<<0))<<16, &ADCONFIG); /* adclk = busclk/32 */
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break;
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case CPUFREQ_NORMAL:
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DCR = (DCR & ~0x01ff) | DEFAULT_REFRESH_TIMER;
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/* Refresh timer for bypass frequency */
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PLLCR &= ~1; /* Bypass mode */
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timers_adjust_prescale(CPUFREQ_DEFAULT_MULT, false);
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PLLCR = 0x05028045 | (PLLCR & 0x70C00000);
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CSCR0 = 0x00000580; /* Flash: 1 wait state */
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CSCR3 = 0x00000980; /* LCD: 0 wait states */
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while(!(PLLCR & 0x80000000)) {}; /* Wait until the PLL has locked.
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This may take up to 10ms! */
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timers_adjust_prescale(CPUFREQ_NORMAL_MULT, true);
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DCR = (0x8000 | NORMAL_REFRESH_TIMER); /* Refresh timer */
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cpu_frequency = CPUFREQ_NORMAL;
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IDECONFIG1 = (1<<28)|(1<<20)|(1<<18)|(1<<13)|(1<<10);
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IDECONFIG2 = (1<<18)|(1<<16);
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and_l(~(0x07<<16), &ADCONFIG);
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or_l(((1<<7)|(1<<1)|(1<<0))<<16, &ADCONFIG); /* adclk = busclk/8 */
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break;
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default:
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DCR = (DCR & ~0x01ff) | DEFAULT_REFRESH_TIMER;
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/* Refresh timer for bypass frequency */
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PLLCR &= ~1; /* Bypass mode */
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timers_adjust_prescale(CPUFREQ_DEFAULT_MULT, true);
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/* Power down PLL, but keep CLSEL and CRSEL */
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PLLCR = 0x00000200 | (PLLCR & 0x70C00000);
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CSCR0 = 0x00000180; /* Flash: 0 wait states */
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CSCR3 = 0x00000980; /* LCD: 0 wait states */
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DCR = (0x8000 | DEFAULT_REFRESH_TIMER); /* Refresh timer */
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cpu_frequency = CPUFREQ_DEFAULT;
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IDECONFIG1 = (1<<28)|(1<<20)|(1<<18)|(1<<13)|(1<<10);
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IDECONFIG2 = (1<<18)|(1<<16);
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and_l(~(0x07<<16), &ADCONFIG);
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or_l(((1<<7)|(1<<0))<<16, &ADCONFIG); /* adclk = busclk/2 */
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break;
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}
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}
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